I will soon have to redo the floor in the back of the van. The coachbuilder fixing it reckons that moisture trapped under the old floor (a couple of sheets of ply screwed to the metal floor) was responsible for the rust that is costing me a shedload to fix...
How should I reconstruct the floor to avoid this happening again? I'm also considering putting in insulation this time around. I'm thinking batons, insulation (Thermawrap), then ply on top; however, I have to bear in mind that insulation done improperly can cause moisture to form too
Any ideas and/or tips?